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Title: Tandem chemical deconstruction and biological upcycling of poly(ethylene terephthalate) to β-ketoadipic acid by Pseudomonas putida KT2440

Journal Article · · Metabolic Engineering

Poly(ethylene terephthalate) (PET) is the most abundantly consumed synthetic polyester and accordingly a major source of plastic waste. The development of chemocatalytic approaches for PET depolymerization to monomers offers new options for open-loop upcycling of PET, which can leverage biological transformations to higher-value products. To that end, here we perform four sequential metabolic engineering efforts in Pseudomonas putida KT2440 to enable the conversion of PET glycolysis products via: (i) ethylene glycol utilization by constitutive expression of native genes, (ii) terephthalate (TPA) catabolism by expression of tphA2IIA3IIBIIA1II from Comamonas and tpaK from Rhodococcus jostii, (iii) bis(2-hydroxyethyl) terephthalate (BHET) hydrolysis to TPA by expression of PETase and MHETase from Ideonella sakaiensis, and (iv) BHET conversion to a performance-advantaged bioproduct, ß-ketoadipic acid (ßKA) by deletion of pcaIJ. Using this strain, we demonstrate production of 15.1 g/L ßKA from BHET at 76% molar yield in bioreactors and conversion of catalytically depolymerized PET to ßKA. Overall, this work highlights the potential of tandem catalytic deconstruction and biological conversion as a means to upcycle waste PET.

Research Organization:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
Grant/Contract Number:
AC05-00OR22725; AC36-08GO28308
OSTI ID:
1807635
Alternate ID(s):
OSTI ID: 1814600; OSTI ID: 1818959
Report Number(s):
NREL/JA-2800-80145; S1096717621001154; PII: S1096717621001154
Journal Information:
Metabolic Engineering, Journal Name: Metabolic Engineering Vol. 67 Journal Issue: C; ISSN 1096-7176
Publisher:
ElsevierCopyright Statement
Country of Publication:
Belgium
Language:
English

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